Unveiling the solid-solution charge storage mechanism in 1T vanadium disulfide nanoarray cathodes

Liang, Xinqi; Chen, Minghua; Zhu, Hecheng; Zhu, He; Cui, Xuehao; Yan, Jiaxu; Chen, Qingguo; Xia, Xinhui; Liu, Qi

doi:10.1039/d0ta02922j

Cited by 40 publications

(32 citation statements)

References 45 publications

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“…Before the growth of PEDOT shell, VS 2 nanosheets are deposited on the carbon cloth via a facile hydrothermal method. [40] During the subsequent nitriding process in ammonia atmosphere, sulfur atom in VS 2 is replaced by nitrogen atom, thus leading to the formation of mesopores structure in VN. Finally, PEDOT shell is constructed on the VN composite by an electrolytic deposition process forming VN/PEDOT core-shell arrays.…”

Section: Resultsmentioning

confidence: 99%

Coupling PEDOT on Mesoporous Vanadium Nitride Arrays for Advanced Flexible All‐Solid‐State Supercapacitors

Chen

Zhang

et al. 2020

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Tailored construction of advanced flexible supercapacitors (SCs) is of great importance to the development of high‐performance wearable modern electronics. Herein, a facile combined wet chemical method to fabricate novel mesoporous vanadium nitride (VN) composite arrays coupled with poly(3,4‐ethylenedioxythiophene) (PEDOT) as flexible electrodes for all‐solid‐state SCs is reported. The mesoporous VN nanosheets arrays prepared by the hydrothermal–nitridation method are composed of cross‐linked nanoparticles of 10–50 nm. To enhance electrochemical stability, the VN is further coupled with electrodeposited PEDOT shell to form high‐quality VN/PEDOT flexible arrays. Benefiting from high intrinsic reactivity and enhanced structural stability, the designed VN/PEDOT flexible arrays exhibit a high specific capacitance of 226.2 F g−1 at 1 A g−1 and an excellent cycle stability with 91.5% capacity retention after 5000 cycles at 10 A g−1. In addition, high energy/power density (48.36 Wh kg−1 at 2 A g−1 and 4 kW kg−1 at 5 A g−1) and notable cycling life (91.6% retention over 10 000 cycles) are also achieved in the assembled asymmetric flexible supercapacitor cell with commercial nickel–cobalt–aluminum ternary oxides cathode and VN/PEDOT anode. This research opens up a way for construction of advanced hybrid organic–inorganic electrodes for flexible energy storage.

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Section: Resultsmentioning

confidence: 99%

Coupling PEDOT on Mesoporous Vanadium Nitride Arrays for Advanced Flexible All‐Solid‐State Supercapacitors

Chen

Zhang

et al. 2020

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“…The S 2p XPS spectrum given in Figure c is separated into three peaks at 160.8, 161.9, and 163.7 eV. The first two peaks are attributed to S 2p 3/2 , while the third peak originates from S 2p 1/2 , indicating the S 2– oxidation state . The separated peaks of S 2p 3/2 could be caused by exposure of the VS 2 to air .…”

Section: Resultsmentioning

confidence: 97%

Rechargeable Mg²⁺/Li⁺, Mg²⁺/Na⁺, and Mg²⁺/K⁺ Hybrid Batteries Based on Layered VS₂

Peng

et al. 2021

ACS Appl. Mater. Interfaces

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Rechargeable Mg batteries have great potential in next-generation scalable energy-storage applications, but the electrochemical performance is limited by the Mg-intercalation cathodes. Hybrid batteries based on dual-cation (Mg2+ and alkali metal cations) electrolytes would not only improve the electrochemical performance but also induce the co-intercalation of Mg2+ with alkali metal cations. As previous reports overwhelmingly focus on Mg2+/Li+ hybrid batteries, in this work, Mg2+/Na+ and Mg2+/K+ hybrid batteries are constructed using a typical layered VS2 cathode and studied in comparison with Mg2+/Li+ batteries. It is observed that Mg2+ could co-intercalate into VS2 with Li+, Na+, or K+. However, Mg-intercalation is irreversible in the Mg2+/Li+ system, and co-intercalation of Mg2+ and K+ would cause a collapse of VS2. Comparatively, the co-intercalation of Mg2+ and Na+ into VS2 exhibits the highest reversibility, and the Mg2+/Na+ hybrid battery shows the best cycling stability without capacity fading within 1000 cycles. Our work highlights the co-intercalation reversibility of a non-pre-expanded layered disulfide cathode and delivers insights for the development of high-performance rechargeable Mg metal batteries.

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“…In general, a lithium metal anode, a separator, an electrolyte, and a sulfur cathode make up a lithium sulfur battery. [ 2 ] Unlike the reversible insertion and extraction of lithium ions in lithium‐ion batteries, [ 49 ] Li‐S batteries rely on a more elaborate conversion mechanism between lithium metal and elemental sulfur. [ 50 ] Specifically, the cathode active substance sulfur is successively reduced to various LiPSs by breaking the bond during the discharge process.…”

Section: Principles Challenges and Design Strategies Of Li‐s Batteriesmentioning

confidence: 99%

Recent advance on Co‐based materials for polysulfide catalysis toward promoted lithium‐sulfur batteries

Qiu

Liang

et al. 2021

Nano Select

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Lithium‐sulfur batteries (Li‐S batteries) have been regarded as one of the most promising technologies to change the status quo of lithium‐ion battery and realize large‐scale energy storage applications. Nevertheless, the process of launching Li‐S batteries from lab to market is seriously hindered by their inherent shortages (for example, shuttled lithium polysulfides (LiPSs), and sluggish redox kinetics), which greatly restrict sulfur utilization and the battery cycle life. In this regard, Co‐based materials are effective to suppress the shuttle effect through anchoring soluble LiPSs and enhancing reaction kinetics. It is of great significance for the development of advanced catalytic materials to clarify the research progress of Co‐based materials in design strategy, modification mechanism and electrochemical properties. Considering this, we conduct a comprehensive review of recent progress with Co‐based materials utilized in Li‐S batteries. Specifically, the state‐of‐the‐art principles, challenges, and build strategies of Li‐S batteries are systematically summarized. Meanwhile, the chemical and catalytic interactions between the Co‐based materials and LiPSs, as well as energy storage performance of Co‐based materials are thoroughly discussed. Finally, we prospect the future opportunities and challenges for the practical application for advanced Li‐S batteries.

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Unveiling the solid-solution charge storage mechanism in 1T vanadium disulfide nanoarray cathodes

Abstract: Ultrathin 1T phase VS2 nanosheets were self-assembled on a flexible carbon cloth to form a binder-free electrode. The electrode exhibited a typical solid solution reaction, which is of great help in inhibiting the structural transition.

Cited by 40 publications

References 45 publications

Coupling PEDOT on Mesoporous Vanadium Nitride Arrays for Advanced Flexible All‐Solid‐State Supercapacitors

Coupling PEDOT on Mesoporous Vanadium Nitride Arrays for Advanced Flexible All‐Solid‐State Supercapacitors

Rechargeable Mg²⁺/Li⁺, Mg²⁺/Na⁺, and Mg²⁺/K⁺ Hybrid Batteries Based on Layered VS₂

Recent advance on Co‐based materials for polysulfide catalysis toward promoted lithium‐sulfur batteries

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Unveiling the solid-solution charge storage mechanism in 1T vanadium disulfide nanoarray cathodes

Abstract: Ultrathin 1T phase VS2 nanosheets were self-assembled on a flexible carbon cloth to form a binder-free electrode. The electrode exhibited a typical solid solution reaction, which is of great help in inhibiting the structural transition.

Cited by 40 publications

References 45 publications

Coupling PEDOT on Mesoporous Vanadium Nitride Arrays for Advanced Flexible All‐Solid‐State Supercapacitors

Coupling PEDOT on Mesoporous Vanadium Nitride Arrays for Advanced Flexible All‐Solid‐State Supercapacitors

Rechargeable Mg2+/Li+, Mg2+/Na+, and Mg2+/K+ Hybrid Batteries Based on Layered VS2

Recent advance on Co‐based materials for polysulfide catalysis toward promoted lithium‐sulfur batteries

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Rechargeable Mg²⁺/Li⁺, Mg²⁺/Na⁺, and Mg²⁺/K⁺ Hybrid Batteries Based on Layered VS₂